Fix closes Issue12529 - cgi.parse_header failure on double quotes and
semicolons. Patch by Ben Darnell and Petri Lehtinen.
diff --git a/Lib/test/test_cgi.py b/Lib/test/test_cgi.py
index e282a51..63547b2 100644
--- a/Lib/test/test_cgi.py
+++ b/Lib/test/test_cgi.py
@@ -377,6 +377,9 @@
         self.assertEqual(
             cgi.parse_header('attachment; filename="strange;name";size=123;'),
             ("attachment", {"filename": "strange;name", "size": "123"}))
+        self.assertEqual(
+            cgi.parse_header('form-data; name="files"; filename="fo\\"o;bar"'),
+            ("form-data", {"name": "files", "filename": 'fo"o;bar'}))
 
 
 def test_main():